it decreases
The optimum PH of pepsin ranges between 1.0 and 4.0. Pepsin exhibits about 90 percent of the maximum activity and about 35% of the maximum activity.
Pepsin is a type of protease that works mainly in the stomach. As a result, its optimum pH is around 2. The high acidity is provided by the hydrochloric acid in the stomach.
Pepsin
It will function at about around the pH of 2.5.
It denatures (enzyme breaks down) because pepsin is best operational in a pH of around 2 or 3 in the stomach juices.
Pepsin was most active in acidic environment from 37 °C to 42 °C. The activity of pepsin was the highest in pH2.0, inactive above pH6.5, and completely denatured or irreversibly inactivated above pH8.0. Therefore, in the solution below pH8.0, pepsin can be reactivated after reacidification. The stability of pepsin at a high pH value is of great significance to the diseases caused by pharynx and larynx reflux. Learn more information at the Creative Enzymes website.
It is most effective at around pH 2, and becomes inactive over 5.
Pepsin becomes inactive when it reaches the small intestine where the pH is between 7 and 9. It functions best when in an acidic environment like the stomach.
Enzymes work within a range of pH levels. Pepsin, which is found in the stomach works in an acidic environment, while trypsin functions in a basic surrounding in the intestines. Increasing or decreasing the pH levels can stop the activity of these enzymes.
Pepsin secreted in the stomach, works at highly acidic pH and the pH could be as low as 2. The optimal pH for pepsin is thus near about 2. This pH is maintained by HCl secreted by the gastric glands in the stomach.
Pepsin doesn't affect the pH but it is active in an acidic environment.
high water activity neutral ph